The method of treatment of dental prostheses

 

(57) Abstract:

The invention relates to the field of dentistry and the manufacture of dental prostheses made of corrosion-resistant alloys with gold coating. The method of treatment of dental prostheses is carried out by deposition of a gold alloy on the base by immersing the prosthesis in an electrolyte containing potassium salt of monovalent gold and additives, keeping it for the given values of current and temperature and constant stirring, rinsing and drying, the electrolyte used is a solution containing various potassium salts, taken in a certain ratio, the process is carried out at a temperature of 65-75°C, current density of 0.2-1.0 A/DM2and the voltage of 0.7-1.0 V, and the exposure time is selected depending on the thickness you want. The method provides quality coverage while reducing the complexity of coating performance. 4 C.p. f-crystals.

The invention relates to medicine, namely dentistry, and more particularly to the manufacture of dental prostheses made of corrosion-resistant alloy with gold plating, and also create a substrate for deposition of ceramic dental prosthesis.

A method of processing Sunny is consistent with the immersion of the prosthesis in electrolytes gilding two compositions, keeping them at a specified voltage, washing and drying. At the same time as the first electrolyte composition using a solution containing a salt of trivalent gold, cobalt chloride, citric acid, amines, hydrochloric acid, taken in the following ratio, wt.%:

Salt of trivalent gold 0,25

Chloride cobalt 0,03

Citric acid 8,0

Amines 0,2

Hydrochloric acid Rest to pH 1

As the electrolyte of the second composition use solution containing dicyanoaurate potassium, sulfaminokislotu Nickel, nitrilotriacetic acid, potassium citrate, formic acid, brightening agent additives and water taken in the following ratio, wt.%:

Dicyanoaurate potassium 0,5

Sulfaminokislotu Nickel 0,4

Nitrilotriacetate acid 1,7

Potassium citrate 6,0

The formic acid 1,2

Boric acid 2,0

Brightening agent additives 0,1

Water The Rest

At the same time keeping in the first electrolyte solution is 3-6 minutes, at a voltage of 4-5, and in the second solution 30-50 minutes at a voltage of 2-4, at room temperature.

Medostatin for the presence of Nickel, the effort to accomplish because of the complex composition of the first electrolyte solution, as well as lack of durability, in particular, the necessity arose through 24 months after manufacturing of the prosthesis to restore coverage.

There is also known a method of treatment of dental prostheses [RF patent №2158564, IPC And 61 With 13/02, 2000] by applying a gold alloy for corrosion-resistant alloy, comprising the sequential immersion of the prosthesis in the electrolytes of the two structures, keeping them at a given current and temperature and constant stirring, rinsing and drying, the electrolyte composition No. 1 using a solution containing a salt of monovalent gold, citric acid, water, taken in the following ratio, wt.%:

Dicyanoaurate potassium 0,15

Citric acid 8,0

Water the Rest, pH 1-1,5

At this time in the electrolyte composition No. 1 is 8-10 minutes at a current density of 0.3-0.5 a/DM2at room temperature, and electrolyte composition No. 2 using a solution containing a salt of monovalent gold, cobalt sulfate, And Trilon, citric acid, potassium citrate trehzameshchenny, zirconium oxide, brightening agent dobavki,0

Cobalt sulfate 0,1

Trilon And 0,25

Citric acid 3,0

Potassium citrate trehzameshchenny 6,0

Zirconium oxide 0,5

Blackbrush additive 0,008

Surfactant 0,008

Water The Rest

At this time in the electrolyte composition No. 2 is 2-2,5 hours at a current density of 0.8-1 A/DM2and room temperature with constant stirring by a reciprocating motion of the cathode rod.

A common disadvantage of known methods is the lack of durability of the coating, and the presence of micropores through which, over time, diffuse basis metal, changing the color of the prosthesis that is totally unacceptable, in particular for ceramic prostheses. This drawback is not eliminated by increasing the thickness of the coating due to a longer deposition process.

In addition, a common disadvantage of known methods is the complexity of coating performance due to the use of several compounds.

The objective of the invention is to improve the quality of the coating by reducing the complexity of coating performance.

The problem is solved pic is relit, containing potassium salt of monovalent gold and additives, keeping it for the given values of current and temperature and stirring, rinsing and drying, characterized in that the electrolyte used is a solution containing various potassium salts, taken in the following ratio, g/l:

Potassium sulfate K2SO4of 9.2 to 9.6

Potassium hydroxide KOH OF 11.6 AND 11.8

The hyposulphite potassium (K2S2ABOUT39,8-10,2

The bisulfite and potassium (K2S2O529-31

Dicyanoaurate potassium K[Au(CN)2] 15-21

Potassium salt of sulfonated

polyunsaturated fatty acids

as a brightening agent

supplements of 0.05-0.1

Water 1 liter

When this process is carried out at a temperature of 65-75°C, current density of 0.2-1.0 A/DM2and the voltage of 0.7-1.0 V, and the exposure time is selected depending on the thickness of the coating, which you want to retrieve.

When implementing the method as a basis you can use:

- frame made of corrosion-resistant alloy;

- working model, which is chemically pre-applied layer of copper.

In the process it is recommended that isoleucine quality of the coating, namely, the increase in hardness and decrease in porosity is due to the formation of sludge, having a crystalline structure with a reduced grain size and inclusion of a phase containing potassium, which in turn is achieved by the proposed combination of ingredients of the electrolyte. This potassium salt of sulfonated fatty acids, such as linolenic, plays an additional role brightening agent and additives. Sufficient hardness and the absence of micropores provide high quality coating and make the possibility of making gold crowns by galvanic method.

This method in the manufacture of gold crowns can successfully compete with wheels, surpassing its accuracy and efficiency.

Examples of specific performance

Example 1. Made bridges with the use of metal based frame of a Nickel-chromium alloy. The prosthesis is carefully polished, degreased, protravlivanie in 25% hydrochloric acid solution for 1 minute, washed in water and veiled in the electrolyte composition, g/l: potassium sulfate K2SO4- 9,2; potassium hydroxide KOH and 11.6; hyposulphite potassium (K2S2ABOUT3- 9,8; biolife water 1 l. the Process was carried out for 1 hour at the temperature T=75°C, the voltage U=0.9 V and a current density of J=0.5 a/DM2.

The method was carried out with constant stirring of the electrolyte, by the reciprocating motion of the rod cathode, which strengthened the frame, to prevent depletion of the near-cathode layer.

The result was obtained by coating the frame with a thickness of 0.02 mm, which can then be applied to the ceramic layer.

Example 2. The polymer copy of the production model (column) by a chemical method was applied to the copper layer, after which the product was draped in a bath. The composition of the electrolyte, g/l: potassium sulfate K2SO4- 9,6; potassium hydroxide KOH and 11.8; hyposulphite potassium (K2S2ABOUT3- 10,2; bisulfite and potassium (K2S2ABOUT5- 31; dicyanoaurate potassium K[Au(CN)2] - 21; potassium salt of sulfonated poly-unsaturated fatty acids - linoleic - 0,1; water - 1 liter

In the received frame crown thickness of 0.3-0.4 mm of chemically pure gold, which can then be coated with the layer of ceramics. The process was carried out for 20 hours at a temperature of T=65°C, the voltage U=0.9 V and a current density of J=0.8 a/DM2. The method was carried out under constant is spruce, to prevent depletion of the near-cathode layer.

To determine the quality of the obtained gold coating of the prosthesis was placed in a furnace and heated to a temperature of 960-1000°C. avoid disappearance of the gold layer, characteristic of fine gold (porous) surfaces.

1. The method of treatment of dental prostheses by applying a gold alloy on a base, comprising immersing the prosthesis in an electrolyte containing potassium salt of monovalent gold and additives, keeping it at the set current values and temperature and constant stirring, rinsing and drying, characterized in that the electrolyte used is a solution containing various potassium salts, taken in the following ratio, g/l: potassium sulfate K2SO4of 9.2 and 9.6, potassium hydroxide KOH of 11.6 and 11.8, potassium hyposulfite K2SO39,8-10,2, bisulfite and potassium (K1S2O529,0-31,0, dicyanoaurate potassium K[Au(CN)2] 15,0-21,0, potassium salt of sulfonated fatty acids of 0.05-0.1 as a brightening agent additives, water to 1 l, and the process is carried out at a temperature of 65-75°C, current density of 0.2-1.0 A/DM2and voltage of 0.7-1.0 V, and the exposure time is selected depending on the thickness of the coating comfortably basics of using a frame made of corrosion-resistant alloy.

3. The method of processing the dentures under item 1, characterized in that is used as a base model, which previously applied layer of copper.

4. The method of processing the dentures under item 1, characterized in that as a brightening agent additives used potassium salt of linoleic acid.

5. The method of processing the dentures under item 1, characterized in that as a brightening agent additives used potassium salt of linolenic acid.



 

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